Valve grinder



Aug. 7, 1928.

D. MANClNl VALVE GRINDER Filed May 27. 1926 INV EN TOR.

ATTORNEY Patented Aug. 7, 1928.

UNITED STATES DONA'IO MANGINI, OF SAXONVILL'E, MASSACHUSETTS.

VALVE GRINDER.

Application filed. May 27,

My invention relates to improvements in portable valve-grinding and lapping machines, and consists essentially of a frame provided with a handle, a spindle journaled in said frame, carrying a bevel-gear, and equipped with a valve-engaging member, a bevel-gear mounted on said frame inposition to intermesh with said first-named bevel-gear, an operating arm attached to said second-named bevel-gear and provided with a handle, holders pivotally connected with said frame, and spring-pressed legs slidingly arranged in said holders, together with such. other parts and meml'iers as may be necessary or desirable in order to render the machine or grinder complete and serviceable in every respect,'all as hereinafter set forth.

The primary object of my invention is to produce a comparatively inexpensive and highly cflicientmachine for grinding and lapping valves, which machine is simple in construction and operation, compact, light in weight, can be easily carried about and placed in grinding position, and is capable of being conveniently operated by hand by means of a handle or crank.

Another object is to provide, in a grinder of the class described, independently springpressed legs, which are capable of yielding to the required extent during the grinding operation, and are also capableof yielding individually to accommodate them to different supporting levels, and which, further more, are adjustable laterally to enable them to be set on supporting points at various distances apart. The legs are also adjustable in relation to their normal projections below their holders.

A. further object is to afford means either for oscillating the spindle which carries the valve-engaging member, or for continuously rotating the same.

Other objects and advantages will appear in the course of the following description.

I attain the objects and secure the advantages of my invention by the mechanism illustrated in the accompanying drawings, in whichj Figure 1 is a front elevation of a valve grinder which embodies a practical form of my invention, parts being broken away to show to better advantage the bearings for the spindle; Fig. 2, a rear elevation of said grinder; Fig. ,3, a detail of the valve-engag ing member and means for attaching the 1926. Serial No. 111,985.

same to said spindle, and, Fig. 1, a top plan of the operating arm and handle, showing the latter, in full lines, in position for oscillating the driving bevel-gear, and, by dotted lines, in position for continuously rotating said bevel-gear.

Similar reference characters designate similar parts throughout the several views.

This machine is adapted both to grind and lap valves while on their seats, by imparting thereto either partial or quickly interrupted revolutions in opposite directions, or a long continued revolution in one direction or the other.

The valve grinder is operated in an approximately upright position, hence will be described as in that position. comprises a frame 1. provided at the top with a handle 2, a spindle 3 on which is secured a small bevel-gear a, a large bevelgearfi loosely mounted on a stud 6 that projectsrearwardly from said frame, said large bevel-gear intermeshing with and driving said small bevel-gear, an arm 7 secured to said large bevel-gear and provided with a handle .8, a pair of adjustable holders 9, two downwardly spring-pressed legs 10, and a valve-engaging member or key 11.

The frame 1 has shoulders 12-12 on opposits edges and below the top thereof. These shoulders are perforated from front to back to receive two screws 13. The stud 6 is lo cated in the vertical center of the frame 1, between the horizontal plane of the shoulders 12 and that of the bottom of said frame. In the lower part of the frame 1 is a recess 14 that. opens through the front and back sides thereof. The frame is bored vertically from below, in the longitudinal center thereof, to provide bearings 15 and 16 respectively above and below the recess 14, for the spindle 3. i

The small bevel-gear t is mounted on that portion of the spindle 8 that passes upwardly through the recess 1%, said bevel-gear being secured to said spindle, in the present example, by means of a. pin 17 passing through the bevel-gear hub into said spindle. The upper part of the spindle 3 is turned down to form a shoulder 18. The shoulder 18 bears against; the bottom end of the frame 1 and the liievel-gear lrests on the bottom of the recess 1. 1, whereby the spindle 3 is held against longitudinal movement in the bearings 15 and 16. but left free to rotate in said bearings. .The spindle 3 is slotted Said grinder lnu d ll

at 19 upwardly from the bottom thereof, and the key 11 is received in the slot thus provided. At the lower end the spindle is chamfered or flattened on opposite sides, and these flattened parts are'perforated to receive a screw 20, as is also the key 11. :On the threaded end of the screw 20 is a nut 21. By means of the screw 20and nuta2l the key 11 is looselyconnected with the spindle.

The key 11 has one edge plain, as at 22, which edgesis adapted to enter the slot in a valve ol one type, and has on theopposite edge lugs 2323 that are adapted to enter theireeessesin avalve of another type. AS herein illustrated, the :key is positioned with the edge 22 down in operative position, but saidkey may be positioned with the lugs 23 down in operative position merelyby removing the nut 21 from the screw 20 and the key from the slot 19, turning the key over, inserting itagain in said slot, and restoring said screw and nutito their former positions.

A nut 24 and a washer 25 may be placed onthe stud 6 behind the bevel-gear 5, tor the purpose of preventing the latter from becoming displaced.

The arm 7 is rigidly attached by any suitable means to the-backside of-the bevel-gear 5,;extends radially beyond the same, and has at the other terminal a rearwardly-extendinglug 2.6. The lug.26 has a tapped opening therethrough in the same radial plane with that in which is located the longitudinalicenter of thearm 7, as clearly shown at 27 in Fig. 2, wherein said lug is broken away ;to disclose such opening. There is also a. tapped .opening 28 in the arm 7 a short distance from the lug 26. The openings Y27 and 28 are of similar diameters, and either is adapted to receive a screw 29 at the inner end of the handle 8. Thus it is seen that the handle 8 can be attached to the arm -7'as aeontinuation or extension thereof in' the same general direction, as when the screw 29 is in the opening 27 in the lug 26, or at rightangles to said arm, as when said screw is in the arm opening 28see dotted line position of handle in Fig. 4:; In the latterarrangement the handle 8 andthe arm 7 form a cranln Each holder 9 has at the upper end an inner, perforated projection that forms a lug 30 to fit behind one of the shoulders 12 and receive one of the screws 13. The screws 13 pass through the lugs 30 behind and the shoulders 12 in front, and thumbnuts 31fare received on the protruding, for- Ward terminals of said screws. lVhen the thumb-nuts 31 are tightened the contiguous shoulders and lugs are clamped securely together between the heads of the screws 13 and saidthumb-nuts, and the holders 9 are thereby held rigidly in place relative to the frame 1. It it be desired to adjust the holders 9, in order to locate the legs 10 carried thereby farther apart or nearer together, the thumb-nuts 31 are loosened, said holders are swung on the screws 13 to the required extent, and said thumb-nuts are retightened.

In addition to the lug 30, each holder 9 has outwardly-extending, upper and under lugs 32 and 33, respectively. The lugs 32 and 33 on each holder are bored vertically or longitudinally to receive the upper terminal ofone of the legs 10. The legs 10 may slide freely up and down in the bearings 32 and 33, but the downward movement of said legs is limited by means of pins 3 1- 34., and springs 35-35 tend constantly to force said legs downwardly.

The legs 10 consist oi rods which pass through the bearings 32 and 33, and the pins 3 lare inserted in and project from said rods above the lower bearings, while the springs 35 encircle said rods between said pins and the upper bearings. Normally, therefore, the springs 35 force the pins 2-H- downwardly onto the bearings 33., and the maximum projection of the legs 10 belowthe bearings 33 is thus determined by said pins. Each leg 10 may have therein for its pin 34 a plurality of transverse openings, as 36, and said pin can be inserted in any of said openings, or changed from one to the other, for the purpose of varying the amount of the maximum projection of the leg below its bearing 33. Adjustment of this kind is needed in order that the grinder shall heapplicable to good advantage to dill'erent engines wherein the valves are located someat higher and some at lower elevations relative to the supporting parts of the engines on which the legs 10 must rest. 7

In practice, after the maximum downward projection of the legs 10 has been provided for, by inserting the pins 34- in the holes 36 in the two legs that are at the proper distance from the ends of the legs to a fl'ord the required projection, adjusting said legs, through the medium of the thumb-nuts 31 and the holders 9, to accommodate their bases to the points of support therefor on the engine block, and arranging the key 11 to fit the valve to be ground, said legs are placed on said block and said key is in serted in the slot or recesses (as the case may be) in said valve, and there, while grasping and pressing down on the handle 2 with one hand, the handle 8 is grasped with the other hand and rocked back and forth or oscillated, assuming that said last-named handle be positioned as illustrated in Figs. 1 and 2. This oscillatory movement imparted to the handle 8 is transmitted by the arm 7 to the large bevel-gear 5, and by said bevelgear to the key 11 (and the valve engaged thereby) through the medium of the small bevel-gear 1 and the spindle 3. Due to the fact that the bevel-gear 4 is so much smaller llll) than the bevel-gear 5, the movement of the handle 8 through an arc of 90 degrees (more or less) causes said first-named bevel-gear to make one or more complete revolutions, with the result that the valve being ground is completely rotated at each stroke of said handle, first in one direction and then in the other. The operation is continued until the valve is accurately ground both onto and into its At the end of the grinding and lapping operation the grinder is lifted oil of the engine block and the key 11 withdrawn from the valve. During the grind ing operation the operator presses dowm wardly on the handle 1, against the resiliency oil the springs 35, to whatever extent may be needed to retain the key 11 in engagemcnt with the valve, and exert the necessary force or pressure on said valve. The amount of oscillation of the handle 8 may, of course, be only sufficient to produce a partial revolution in each direction on the part of the small bevel-gear, and, consequently, on the part of the valve being,

ground. The operator is, therefore, able to regulate without diliiculty his stroke and the amount and character of rotation imparted to the Valve, and thus to obtain the best results in the shortest time.

In the event the parts of the engine block on which the legs 10 rest be uneven, or higher at one point than another, the springs 35 enable one leg to move upwardly a greater distance than the other leg and thus to accommodate or adjust themselves to the existin; condition.

If it be desired to impart a continuous rotary motion in one direction for some length of time, the handle 8 is removed from the lug; and attached to the main part of the arm 7 and at right-angles thereto. When the handle 8 is thus attached to the arm 7, and while the key 11 is held in engagement with the valve to be ground, by downward pressure on the handle 2, said handle 8 is operated like a crank handle for a length of time sullicient to grind the valve, although during such period it is usual to reverse the direction of movement of the handle 8 one or more times.

More or less change in the shape, size,

construction, and arrangement of some or all of the parts of this valve grinder may be made, without departing from the spirit of my invention, or exceeding the scope of what is claimed.

lNhat I claim as my invention, and de sir-e to secure by Letters Patent, is-

1. The combination, in a valve grinder, with a frame provided with a handle, a spindle, for a valve-engaging member, journaled in said frame, a driven member secured to said spindle, and a driving member mounted on said frame and engaging said driven member, said driving member being provided with an operating arm, of holders pivotally connected and parallel with said frame, and having upper and under bear ings, and legs carried by said holders in said bearings, said holders being adjustable to increase or decrease the distance between said legs.

2. The combination, in a valve grinder, with a frame having perforated shoulders and provided with a handle, a spindle, for a valve-engaging member, journalcd in. said frame, a driven member securedv to said spindle, and a driving member mounted on said frame, engaging said driven member, and provided with an operating arm, of iolders having inwardly extending periorated lugs adapted to lie against said shoulders, and also having 0utwardlyrXtending upper and under lugs, screws passing through said shoulders and first-named lugs, thumb-nuts on said screws, whereby said holders maybe adjusted toward and away from each other, and perforated between said upper and under lugs, legs slidingly arranged in said upper and under lugs, pins insertable in any of the perforations in said legs, and springs interposed between said pins and said upper lugs, whereby said pins are normally retained on said under lugs, the position of said pins determining the normal compression of said. springs, and the construction and arrangement being such that said legs are adapted to rest on surfaces at different elevations and support said frame thereon.

DONATO MANCINI. 

